Chemistry: Post your doubts here!

[ciephobia]

Effective collision refers to collisions with sufficient energy to react. Since temperature did not change, there is no change to proportion of such collisions.

hey, sorry to disturb you but can you help me with this?
thanks in advance.

 

[qwertypoiu]

View attachment 54433
I know it's +2 with cold but how is it -1 with hot?

The OH group on the left gets oxidised to CO2H group.
CO2H group makes this previously chiral carbon non chiral. So -1

Edit: sorry it's secondary so it'll make a ketone but same answer still.

 

[qwertypoiu]

hey, sorry to disturb you but can you help me with this?
thanks in advance.

The precipitate is Ca(OH)2. It's only very partially soluble so will form a white solid. After filtration only Ba(OH)2 remains in high concentration. The barium hydroxide reacts with CO2 to form a white ppt, BaCO3

 

[ciephobia]

The precipitate is Ca(OH)2. It's only very partially soluble so will form a white solid. After filtration only Ba(OH)2 remains in high concentration. The barium hydroxide reacts with CO2 to form a white ppt, BaCO3

God bless you.

 

[Mathemagical]

View attachment 54433
I know it's +2 with cold but how is it -1 with hot?

The secondary alcohol group on the left will be oxidised to a ketone group, so there will be one less chiral centre.

 

[nehaoscar]

Cl went from -1 to +1 (in OCl- ion)

But then it's asking for nitrogen so don't you only look at the nitrogens?

 

[nehaoscar]

 

[nehaoscar]

How will the H+ ions react to shift equilibrium to right?

 

[nehaoscar]

How B... Don't they all just for 1 alkene as there is only 1 OH group? :/

 

[♣♠ Magnanimous ♣♠]

View attachment 54438

Helium is the answer
Am I right?

 

[qwertypoiu]

But then it's asking for nitrogen so don't you only look at the nitrogens?

I think the statement is badly worded. However, had nitrogen undergone both oxidation and reduction it would be called a disproportionation reaction. But the reaction here is definitely redox.

 

[qwertypoiu]

View attachment 54440
How B... Don't they all just for 1 alkene as there is only 1 OH group? :/

When butan-2-ol is dehydrated it may form the following:

• but-1-ene
• cis but-2-ene
• trans but-2-ene

 

[qwertypoiu]

View attachment 54439
How will the H+ ions react to shift equilibrium to right?

H+ will react with the OH- ions, producing water. This reduces the concentration of OH-, shifting the equilibrium right

 

[qwertypoiu]

View attachment 54438

Helium, since it has the least intermolecular forces.

 

[princess Anu]

Oh.. I see... Is it also means that 1 mole of (NH4)2CO3 has 3 mole of oxygen atoms/ 1 mole of carbon/ 8 mole of carbon atoms?

not 8 moles of Carbon atoms.. It is one mole of C atoms

 

[nehaoscar]

Helium is the answer
Am I right?

Yes but why is it helium?

 

[♣♠ Magnanimous ♣♠]

Yes but why is it helium?

The main assumptions made by the ideal gas equation are:

1. The volume of the gas particles is small relative to the volume occupied by the gas.
2. There are no forces of interaction between the gas particles.
3. Collisions between individual gas particles, and between gas particles and the walls of the container are elastic, that is momentum is conserved.

Helium gas is monatomic, and the helium atom is small, satisfying condition 1.

The helium atom is spherical and has no dipole moment so the attractive forces between helium atoms are small, satisfying condition 2.

Being spherical, collisions between helium atoms approach the ideal condition of elasticity, satisfying condition 3.

 

[nehaoscar]

 

[nehaoscar]

Answer is D but what would reaction in B be?

 

[nehaoscar]

Why is the bond weaker - B?